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Conductor's Special 127H Train Horn Kit

(Non-Weather Sealed Air Supply)


21 reviews

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A popular choice for anyone that doesn’t have a lot of room to work with, our Conductor's Special 127H train horn kit is one of the most versatile train horn kits available. Our Shocker XL train horn and 127H air source unit make the perfect pair when space is scarce. Not only that, but it is the most cost-effective way to get your hands on one of our popular Conductor's Special kits!

Unlike many of the other train horns available, our Shocker XL train horns are uniquely equipped to fit in tight spaces. Most train horns come on a huge metal manifold, which looks really cool but can be difficult to fit if you are limited on install space. Our Shocker XL train horns, however, are four separate bells made of a super durable ABS composite. What this means is the horns don’t have to all be installed in the same spot and can be spread out in just about any configuration. Don’t let them fool you though, these horns have the full range and volume of the real train horns. Our Conductor's Special kits are not only the second loudest kit we offer but they are also hand-tuned to the exact US Train Chord specifications, making them the best bang for your buck!

Just as our Shocker XL train horn is the perfect horn for tight installs, our 127H air source unit is the perfect system if you are limited on space. While this system is not enclosed and will need to be installed out of the elements, it does have one of the smallest footprints out of all the onboard air kits that are available. Sporting a 1 ½ gallon tank and a Viair 275C air compressor, our Conductor's Special 127H train horn kit provides you with enough air for a 2-3 second honk time and recovers from 90-120 PSI in only 30 seconds! This is a self-contained kit, meaning installation is easy and the only maintenance needed is draining the tank on a regular basis. If you are looking for a big train horn sound in a small package that doesn’t require a lot of upkeep, this is the kit for you!

  • The loudest horns we manufacture, be heard for miles!
  • Stainless steel internals combined with the fiberglass-reinforced ABS construction ensures these horns are extremely durable through all conditions!
  • Individually mounted horns for flexible installation
  • All-inclusive train horn kit with everything needed for installation
  • 120 PSI 1.5-gallon air system provides 2-3 seconds of honk time

(Note: Tank mounted air compressors are not fully sealed. For this reason, the manufacturer recommends the tank/compressor system be mounted in the upright position in an enclosed space away from moisture, dirt, debris, etc... Failure to mount this product as directed will void the warranty)

**Detaching the compressor from the tank will void your warranty on this kit. If you need a solution where the compressor is detached, please look at our 232 and higher models. **

Please note: The 6 horn upgrade kit does NOT include the extension brackets to connect to our Shocker XL horn mount.


This video shows our Shocker XL Train Horn in a third-party decibel test alongside your typical "air horn" honked side-by-side at the same pressure. As you can see, no one even comes close to the insane volume and tone of our Shocker XL Train Horns!
0 2.03 10 0 57.5 10
10 1.17 12 1.0 32.0 13
20 1.11 13 2.0 30.0 14
30 1.04 15 3.0 28.5 16
40 1.01 15 4.0 26.5 16
50 0.97 16 5.0 24.5 17
60 0.92 16 6.0 22.5 17
70 0.88 17 7.0 21.5 18
80 0.83 17 8.0 20.0 18
90 0.79 17 9.0 18.5 18
100 0.76 18 10 17.0 17
110 0.72 18
120 0.67 18
0 to 120 PSI 2 min. 10 sec. (±10 Sec.)
90 to 120 PSI 35 sec. (± 5 Sec.)

* Supply Voltage: 13.8 Volts

  • Part Number: HK-S4-127H
  • Operating Pressure: 120 PSI
  • Restart Pressure: 90 PSI
  • Voltage: 12-Volt DC
  • Horn: Shocker XL train horn
  • Horn Material: High-impact fiberglass reinforced ABS
  • Horn Measurements   
  • № 1 19.50″ (495.30 mm) № 2 16.25″ (412.75 mm)
    № 3 14.75″ (374.65 mm) № 4 12.75″ (323.85 mm)
  • Horn Flare: 5″ (127 mm)
  • Air Source Unit: HornBlasters 127H air source unit
  • Air Source Length: 15.2″ (386.08 mm)
  • Air Source Width: 5.9″ (149.86 mm)
  • Air Source Height: 12.8″ (325.12 mm)
  • Air Source Weight: 13.75 lb (6.24 Kg)
  • Air Tank: 1.5 Gallon 4 Port Tank
  • Volume: 1.5 gal (6.6 L)
  • Air Compressor: 275C air compressor
  • Max Amperage: 18 amps
  • Maximum Duty Cycle: 25% @ 100 PSI
  • Money-Back Guarantee/Refund Policy
    All merchandise unless otherwise indicated may be returned within 30 days from the shipment arrival date for a refund. A Returned Merchandise Authorization (RMA) number is required for all returns. A 15% restocking fee may apply. Additional deductions may be made to reflect the products current market value. These terms apply to all refunds. Most products are shipped with a refund/replacement guarantee period unless otherwise noted in the product listing. Customers must inform of any order discrepancy within 7 days from the invoice date so that we may investigate and resolve the situation accordingly.
  • Warranty
    Our Shocker XL Train Horns are backed by our Lifetime Manufacturer's Defect Warranty and the rest of the components in this kit are backed by our One-Year Manufacturer's Defect Warranty.
  • Satisfaction Guarantee offers our customers a 30-day satisfaction replacement or refund guarantee on all purchases, except when otherwise noted in the product listing.
  • Cross-Shipments will not cross-ship returned merchandise.
  • Physical Damage Policy
    Physical damage to any product purchased at will effectively void warranty coverage. Physical damage includes but is not limited to improper handling and/or any other type of damage sustained by irregular usage.

Warnings & Notices

Hearing Loss warning icon
Hearing Protection Required

This product produces extreme loudness. Proper hearing protection must be worn at all times during its operation. Hearing loss or permanent damage may result from unsafe use. Use this product in a safe and responsible manner and at a distance of at least 100 meters from others. Never operate this product in a closed environment, in close proximity to living beings, or where prohibited by law.

Safety warning icon

This product can expose you to chemicals including lead, which is known to the State of California to cause cancer and birth defects or other reproductive harm. For more information, go to

Customer Reviews

5.0 Based on 21 Reviews
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Filter Reviews:
Andre R.
United States United States

100% recommended

Charles B.
United States United States

Conductors special

After installing everything and being worried if I had enough lengths of everything for my land yacht, I’ve been nothing but utmost happy with my purchase, 100/10 recommend for anybody and everybody!


HornBlasters Tech Support from Newmar RV Owner

I was lost as I am not to great at mechanics. Alex walked me through what wires I needed to look for, how to test to make sure, and how to complete the powering to ground connections. Alex was patient in a way I have not experienced much. I feel confident I can upgrade at any time and rest assured that I have done the install by the book and l look forward to years of trouble-free satisfaction when being cut off by reckless, inconsiderate drivers.

Steven S.
United States United States

Awesome horns

Easy install and awesome sound that vibrate my excursion. As a system it definitely delivered what it said


That lil something that was needed

Had a omega train horn kit just wasn't loud enough or the tone I wanted. Ordered this kit to replace it and wasn't disappointed.